diff --git a/include/__config b/include/__config
index f1b7390..0d9d723 100644
--- a/include/__config
+++ b/include/__config
@@ -479,9 +479,10 @@
 
 #define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__))
 
-// No apple compilers support ""d and ""y at this time.
-#if (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 800) || defined(__apple_build_version__)
-#define	_LIBCPP_HAS_NO_CXX20_CHRONO_LITERALS
+// Literal operators ""d and ""y are supported starting with LLVM Clang 8 and AppleClang 10.0.1
+#if (defined(_LIBCPP_CLANG_VER) && _LIBCPP_CLANG_VER < 800) || \
+    (defined(__apple_build_version__) && __apple_build_version__ < 10010000)
+#define _LIBCPP_HAS_NO_CXX20_CHRONO_LITERALS
 #endif
 
 #elif defined(_LIBCPP_COMPILER_GCC)
diff --git a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
index bb0cba1..946e742 100644
--- a/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.day/time.cal.day.nonmembers/literals.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
 // UNSUPPORTED: clang-5, clang-6, clang-7
-// UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8, apple-clang-9, apple-clang-10, apple-clang-11
+// UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8, apple-clang-9
 
 // <chrono>
 // class day;
diff --git a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
index 4230034..abc3dcd 100644
--- a/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
+++ b/test/std/utilities/time/time.cal/time.cal.year/time.cal.year.nonmembers/literals.pass.cpp
@@ -7,7 +7,7 @@
 //===----------------------------------------------------------------------===//
 // UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
 // UNSUPPORTED: clang-5, clang-6, clang-7
-// UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8, apple-clang-9, apple-clang-10, apple-clang-11
+// UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8, apple-clang-9
 
 // <chrono>
 // class year;